Air Quality Sensor Output

I tested 7 low-cost air quality sensors in a couple of indoor and outdoor locations throughout Pittsburgh (here's more on sensor setup).

 

Baseline Output in my Lab

After a few days of preheating, I tested the baseline output in my lab.

Average Output

CO (MQ) 253
CO (TGS) 362
VOC 213
SnO2 152

Average Output

Exhaust 323
Diesel 163
Ozone 297-310
Dust 6

 

 

Outside CMU NSH Building

Sensors on a bench, right outside the Carnegie Mellon NSH Building

Average Output

CO (MQ) 358
CO (TGS) 350
VOC 202
SnO2 143

Average Output

Exhaust 309
Diesel 273
Ozone 35
Dust 6

 

 

Forbes & Morewood Bus Stop

Sensors on the ground, a few feet away from Forbes & Morewood bus stop

Average Output

CO (MQ) 270
CO (TGS) 338
VOC 249
SnO2 175

Average Output

Exhaust 338
Diesel 259
Ozone 48
Dust 18

 

 

Parking Garage

Sensors on the ground in a parking spot in a garage

Average Output

CO (MQ) 368
CO (TGS) 336
VOC 218
SnO2 160

Average Output

Exhaust 323
Diesel 180
Ozone 232
Dust 16

 

 

Laundry Room

On a washing machine in my building basement

Average Output

CO (MQ) 300
CO (TGS) 465
VOC 470-520
SnO2 300

Average Output

Exhaust 378
Diesel 217
Ozone 490
Dust 11